Processes for preparing alumina and various other products

a technology of alumina and other products, applied in the field of chemistry applied to the production of alumina, can solve the problems of inefficient segregation, inability to remove most of the impurities and especially iron, and inability to achieve adequate removal of iron
US9382600B2Active Publication Date: 2016-07-05ORBITE ALUMINAE INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
ORBITE ALUMINAE INC
Publication Date
2016-07-05

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Abstract

There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HCl so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AlCl3, and separating said precipitate from said liquid; and heating said precipitate under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced. These processes can also be used for preparing various other products such as hematite, MgO, silica and oxides of various metals, sulphates and chlorides of various metals, as well as rare earth elements, rare metals and aluminum.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application is a 35 USC 371 national stage entry of PCT / CA2012 / 000871 filed on Sep. 17, 2012 and which claims priority on U.S. 61 / 535,435 filed on Sep. 16, 2011, on U.S. 61 / 584,937 filed on Jan. 10, 2012, and on U.S. 61 / 668,646 filed on Jul. 6, 2012. These documents are hereby incorporated by reference in their entirety.TECHNICAL FIELD

[0002] The present disclosure relates to improvements in the field of chemistry applied to the production of alumina. For example, it relates to processes for the production of alumina via the extraction of aluminum from aluminum-containing materials. These processes can also be efficient for preparing other products such as hematite, MgO, silica and oxides of various metals, sulphates and chlorides of various metals, as well as rare earth elements, rare metals and aluminum.BACKGROUND OF THE DISCLOSURE

[0003] There have been several known processes for the production of alumina. Many of them were us...

Claims

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